Manufacture of artificial goods from viscose



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MTED' STATES PATENT OFFICE.

MAX LUF'T, F BORAS, SWEDEN.

MANUFACTURE OF ARTIFICIAL GOODS FROM VISCOSE.

IiTo Drawing. Application filed March 9,

exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to the manufacture of artificial fabrics, filaments, films and the like articles from viscose (cellulose-Xanthate) and has for its object to render the manufacture more expeditious and produce a cellulose which is of uniform character, consistency, lustre, and feel.

The manufacture of filaments, films, plates and the like from, viscose, which forms an unstable solution, depends upon several conditions, as for instance upon the state of maturation of the viscose, upon the several byproducts and the partly gaseous objectionable products of decomposition of the Xanthate. These conditions are practically for the most part not controllable and cause great losses of material and affect the lustre, the strength, and the uniformity of the formed cellulose-hydrates.

I have found that the acids of the naphthenes or the aqueous solutions of their salts added to the solution of Xanthate have a surprisingly favorable effect, as they bind the sulphur-by-products and the impurities of the viscose, improve the uniformity and durability of the solution and render the precipitation or separation of the cellulosehydrates uniform and independent from the state of maturation of the raw viscose used.

sulphur and for sulphides is-accordingto v Specification of Letters Patent.

Patented Feb. 28,1922.

1920. Serial No. 364,542.

Itenouard Les matieres grasses 1919so intensive that they are capable to devulcanize the caoutchouc and may be used for the regeneration of'the same.

I found that in the alkaline solutions of viscose the acids of the naphthenes bind the sulphides, thiocarbonates, and other impurities containing sulphur, without influencing in any waythe Xanthate. The viscose does not coagulate and the solutions remain homogeneous. They may be used without further treatment for the manufacture of the artificial goods, for instance they may be spun in acid solutions of salts. The acid of the naphthenes freed from the threads during the spinning process continues to act in the spinning bath and hinders the ad'- verse reactions of the sulphides taking place'under ordinary circumstances. The resulting products are smooth and uniform in lustre and softness as well as in strength and elasticity.

To carry out my process the liquid acid of naphthenes which ought to be free from resin or preferably the aqueous or alkaline solutions of the salt of the acid, is allowed to flow in and is uniformly mixed with the common alkaline solution of the Xanthate.

.The waste solutions of the petroleum factories represents such an alkaline solution. The acid of naphthenes or its salts may be added to the, finished solution of the viscose or to the alkaline water with which the viscose is stirred and diluted.

The quantity of the free acid of naphthenes used depends upon the quantity of CS required for the formation of the Xanthate and is about five per cent of the latter quantity. The acids of the naphthenes and their sulphur compounds may be separated from the baths in the usual manner, recovered and used again, which =renders the process much cheaper. The resulting artificial goods are thereupon washed and treated in the common way.

I claim:

l. The improvement in the manufacture of artificial goods from viscose consisting in the addition of acids of naphthenes to the solu- 100 tion of viscose for the purpose described.

2. The improvement in the manufacture of artificial goods from viscose consisting in the addition of acids of naphthenes together with alkaline diluting Water to the Xanthate as and for the purpose specified;

3. The improvement in the manufacture of artificial goods from viscose consisting in the addition to the viscose of any of the salts of the acids of naphthenes which are soluble in water as and for the purpose specified. a

In testimony whereof I aflix my signature.

MAX LUFT. 

